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12. Impact of the Solid‐Electrolyte Interface on Dendrite Formation: A Case Study Based on Zinc Metal Electrodes.

Author

Gregory, Darrell, Britten, Collin, Bal, Batuhan, Abbott, Brandon S., Özdogru, Bertan, Walters, Keisha B., and Çapraz, Ö. Özgür

Subjects
ZINC electrodes, DENDRITIC crystals, ORGANIC conductors, AQUEOUS electrolytes, SCANNING electron microscopy, ORGANOMETALLIC compounds, ELECTROLYTES
Abstract

The formation of dendrites is the bottleneck to harvest the high theoretical capacities of metal anodes. In this study, we investigated the impact of the solid‐electrolyte interface (SEI) layer on the electroplating of zinc metals in organic and aqueous electrolytes by using electrochemical techniques coupled with SEM, FTIR, and XPS. First, the electrochemical response of Zn plating in organic or aqueous electrolytes was compared with the ones for Li and Na metal plating by using analogous perchlorate salt dissolved in the same organic solvent. Under similar charge conditions, the cycle life of the metal electrodes was longer in the order of Zn (aqueous)>Li>Zn (organic)>Na. In organic electrolytes, the cycle life of the PAO‐Zinc is almost three‐fold longer than the as‐received zinc electrodes. The methodology established here can be used to study the impact of electrolyte salt and additives on the formation of dendrites on metal electrodes. [ABSTRACT FROM AUTHOR]

Published
2022
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13. Electrochemical behavior and morphological evolution in carbonaceous and metal anodes for Li-ion and Zn-ion batteries

Author

Gregory, Darrell Reid

Abstract

Li-ion batteries are ubiquitous in modern society with widespread applications in electric vehicles, personal electronics, and renewable energy storage. However, the practical energy density of the graphite anode commonly used in commercially available Li-ion batteries is approaching its theoretical limits. One potential solution to overcome this limitation is to replace graphite anodes with metallic anodes which have much higher theoretical charge storage capacities (3860, 1165, 860 mAh/g for Li, Na, Zn metal anodes respectively vs. 372 mAh/g for graphite). Unfortunately, problems arise during charging of metal anodes when metal ions are plated onto the electrode. These ions tend to deposit unevenly over the surface producing rough morphologies called dendrites which can grow through the separator and contact the counter electrode causing a short circuit, thermal runaway, and potential ignition of the flammable electrolyte and explosion.

Published
2021

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